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ADT7461AARMZ-2 数据手册 - ADI（亚德诺）
制造商:
ADI（亚德诺）
分类:
温度传感器IC
封装:
MSOP
描述:
± 1°C的温度监测器，串联电阻抵消 【1∑C Temperature Monitor with Series Resistance Cancellation
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ADT7461AARMZ-2数据手册
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ADT7461A
Rev. A | Page 3 of 24
GENERAL DESCRIPTION
The ADT7461A
1
is a dual-channel digital thermometer and
undertemperature/overtemperature alarm, intended for use in
PCs and thermal management systems. It is pin- and register-
compatible with the
ADM1032 and the ADT7461. A feature of the
ADT7461A is series resistance cancellation, where up to 1.5 kΩ
(typical) of resistance in series with the temperature monitoring
diode can be automatically cancelled from the temperature result,
allowing noise filtering. The ADT7461A has a configurable
ALERT
output and an extended, switchable temperature meas-
urement range.
The ADT7461A can measure the temperature of a remote
thermal diode accurate to ±1°C and the ambient temperature
accurate to ±3°C. The temperature measurement range defaults
to 0°C to +127°C, compatible with the
ADM1032, but it can be
switched to a wider measurement range of −64°C to +191°C.
The ADT7461A communicates over a 2-wire serial interface,
compatible with system management bus (SMBus) standards.
The default SMBus address of the ADT7461A is 0x4C. An
ADT7461A-2 is available with an SMBus address of 0x4D. This
is useful if more than one ADT7461A is used on the same SMBus.
An
ALERT
output signals when the on-chip or remote tempera-
ture is out of range. The
THERM
output is a comparator output
that allows on/off control of a cooling fan. The
ALERT
output
can be reconfigured as a second
THERM
output, if required.
1
Protected by U.S. Patents 5,195,827; 5,867,012; 5,982,221; 6,097,239;
6,133,753; 6,169,442; 7,010,440 ; other patents pending.
DIFFERENCES BETWEEN THE ADT7461A AND THE
ADT7461
Although the ADT7461A is pin- and register-compatible with
the ADT7461, there are some specification differences between
the two devices. A summary of these differences is shown in
Tabl e 1.
Table 1. Differences Between the ADT7461A and the ADT7461
Specification ADT7461A ADT7461 Unit
Supply Voltage 3 to 3.6 3 to 5.5 V
Maximum Local Sensor
Accuracy
1 3 °C
Maximum Series Resistance
Cancellation
1.5 3
kΩ
Average Operating Supply
Current
16 Conversions/sec 240 170 μA
Standby Mode 5 5.5 μA
Maximum Conversion Time
One Shot, Averaging On 52 114.6 ms
One Shot, Averaging Off 8 12.56 ms
Remote Sensor Current Levels
High 220 96 μA
Mid 82 36 μA
Low 13.5 6 μA
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